doxepin drug pathway doxepin pharmacodynamics pathway 2015-12-03T10:08:21Z PW:0002312 The pathway of doxepin-target interaction and of the biochemical or physiological responses to drug. The drug is used in the treatment of depression, anxiety disorders, insomnia. Its effects result from inhibition of serotonin and norepinephrine neurotransmitter reuptake. Genetic variations can cause differences in the response of the organism to the drug. pathway vpetri